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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca36d0f8097bc0c0e9efe423f437e3cca9c61dfa1bbd90b3e5abdf471e7c34f8' 
  AND token = '7YhPDvkWmJ17aNor5ldKuU8mGGqqcy6EgOH5MfbVROU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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