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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b676144cd76f78d8c22d49f8e9a5b4339713b121512f28ebed9e2e8b083036' 
  AND token = 'QhGKTT+RzcT/w1yWScwfhrl3NsKtvav0a4SGCkd0tQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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