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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4260e259c93ccdfc7f39f8f5a94cca69518dd9026e066a0cf388f9a7bb0d1fef' 
  AND token = 'J0zGQuG6baDrx4RNYlCrF3PLrLVGX5M43sNj3wUZTng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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