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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd027d0a5cf0f0947092da9296a6be4d623f52be1a430be493f9aa4e3b218558b' 
  AND token = 'Z6xH8R0aj9MWYZ0SeaUlDzedQX2Rg7DwV6GPpJ1GfuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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