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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d9a34910fa2c6ecad8802826b279ec7c13b1fdb17eaa04fadbfa62757eb238' 
  AND token = 'yQ9MV3XE5J0kNXRdaaJtHhctb/yPSu70FYs72EQLg0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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