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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ee44e1bcad8c7bc544dc9a7e23f5566b0515cf9f6c8571044ca3452fb28c65' 
  AND token = 'Qpm/WiHx4rSjmyf6C+hsmJH/4mVj3KWYd5ofpUJvI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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