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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b50657929a9f723a82643332abeabece1e007f6033f8da214012ca4caafd63f' 
  AND token = '7mCsvdxPghNTIc5r6rXCwxulYol0pfYFHUmdGgtRMic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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