SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17590b949c72fcea93066cadcb94889da622d1d8a0eb9948403d96679007956f' 
  AND token = 'zgcnMKQ7QGlmN9vWplG6UZ9tYCQoKZAVzFEJhJJxsMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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