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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967a69f948d2f43996b49c492a6e44301e91ba6d8ef9696e5ceaefe87cbce829' 
  AND token = 'Iu2CqasB8MMxzX14THLEcoDwYb4YERKEK5z21zH2zYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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