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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a84634f094462f8203c475aee9f3f04629763a7342dc848735811de879d2ba0' 
  AND token = 'p4ZUhpvrPRZOnBeNFy6e3iB055xTzgq5r79UTVtoGV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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