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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad20b4ae15664f94207aee541e05b6f810fe4efb1ef76bc06da454a16ea887a' 
  AND token = 'pRGXvKqlnJ+2WaBY3HAiktRMeWCRxiSjPkPEtvTqTC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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