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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251b4855ae372a74c5a98954405f2573dfe46c884463c1bc45dd7fb3d0002a6a' 
  AND token = 'yrJq2crbEilA0ROIXiqyRSkrm7CHeJ9MtwaXdhjhJ64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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