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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444bd3c01b312f18bd00c30b7e08e77542259c8acea000f84e4898f5951bfb81' 
  AND token = 'F34eJuSHwUedhVRc9rqyZad4J5ndEOfIjaO98DkKY4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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