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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767c8a0b8b724ab6e59de7e1c363f7cd2ba6a8fbb363a86767a0113bffaa80e8' 
  AND token = '7LgGtzwtJwz7c9Hbp8pJhcp7SShYY0gFwboChS4SgAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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