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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba73ebe37059a3205357b106cd661890b9787880f0814a69f21148c83253bfc' 
  AND token = '9vq2XjC87e3N5gekd28u+5BaKoK7kBv/S3QTJ7o00Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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