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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbc9c7cba930b6d090b24dfa913724878e44eee11876d93c5fa75064dd97ae8' 
  AND token = 'ZYvynjoLxbyH1XKp7nMqunlg/qn5Zn2H3D3oQnkDQN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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