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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c067d7c60974619714843527fa7e1e693697f84892870aa76acdf9f80480d98e' 
  AND token = '81Ia4DqT1M0BzSKmXaBtmWdhrwaTZnkHEysdOEKOKmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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