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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcaf1f7033b3d30ee2bd2f61886b6cd6fe00777ed378bef1a6bb415d8da1d8f' 
  AND token = 'vGXo7JTI2EkDF+w9zetQ9jQOZjz+otpsCEwfjmHCu0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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