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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e8666af52c09417b6ca683b4e0be41d4b5ef9fdab038ee9029a78302c70688' 
  AND token = '79EazMLXXj33N11pbnuXmA6rGBkD9pXjeVolMctJWoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00158

JSON explain

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