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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79f0d82e37783f2f4e08eac1e9d6cf094b41702f0f97a17a186ba6cde7c1035' 
  AND token = '7PlrE2o9fLXiAIOX1isyxHXffumn0+V2aAertN/i0Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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