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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261caf978c8ebaf69b6f901a00525477c30ac10bbfdb7e600c83c5fad10f23ce' 
  AND token = '2SQZnC3UwhkjB0i8F75bKxpA43C31DNKfP32sQG4wSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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