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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e97a248ba7c71c32f3ce90f58508afffdb40ffc728585dd0b923823bc57b4e' 
  AND token = 'r/lCiGoUWBMh1DCP1KaWKL6IIm9gX3tKdM8N4b794AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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