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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14787c231da766bfb13b246fc50fe79368bb42b6da5fabcc59770775a554f96d' 
  AND token = 'h+frX05bH5Sfb6vU1W0gH2l71UIgJHkPiZGdkEHv6yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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