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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6138ea943a7cadb2b460c377946de2f8b8fe69d627446dc8a1f4b808c0b8391' 
  AND token = 's9lAUZiWSPs9ifkE+6JWkhCy8DJmf+iGBev4WuhXFbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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