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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd83b04e164e2a3f7d74c4a4aaa6525ffb2c68fc1660e7239b643405742188a3' 
  AND token = 'h5PSm6N0HL31qpjR89nhcndpAi3blM1BzWROeIERxHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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