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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceed98074bee32abbc2b6d0b9924e0125a1ed1a38d98477e3be8836fe4a2686e' 
  AND token = 'mlbRhytSCsTziqmvvsBnvjiLasTPnrX4EB+lvPAwy7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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