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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc40da603a68ba74308fe7ff6ca649fbf70d07267b499c8c040281c305b64ee0' 
  AND token = 'BjqvaREv76/N5F04VhbO3J+XK6bBxOlLdqQK9YImjQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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