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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61cbbcdef66ee478edd90489cb5cb2318a5f84cf50d002a0745a0201b8148aa' 
  AND token = 'R5heDdom+G/YOc07GIuFRxzPat+aYSj4fi/vuUBBMFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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