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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23134aafb5299e0ad459fb379a52b8f115c91ba9882fa5123c5f32ddef93f0c0' 
  AND token = 'P6GdKpNDnuexp4GzFdWPKHO1h0C0xUG5AnqyQN5XJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}