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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561a596cc27a7b35cb70f373c05ff0f95f23b9978bbe797de78490485ebadcaa' 
  AND token = '5hfROw5nmWmg5IULi6DzQpeYeENpVcf/1S+oplNH5qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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