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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134b72030b94f0258eee82bb5074f51be3df2436568bec4942a78b3acc105822' 
  AND token = 'MgES47GY4sMp0jz7/QZ/RFoKQy/TSp57Z0LsVRUM1Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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