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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84174149ab98f7d64ade4334bebf2cfd259603b2f3a89e89664486710d5dfb66' 
  AND token = 'z56NMpalolf76G43L5clqCcwt9E3Z5QWVk6dnQSWscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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