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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab987b32376b46f2405ea4e2cc5b1afae3d761c1dd9ca338052aa16664b846de' 
  AND token = 'DQfazqxkOuzyVjSevoHRma37qJG3xUNXXn9VGdqr31s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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