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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee73457eeeb334063aa0c38a0f631206be420ba9e365c74fd94ea240a8e00ea' 
  AND token = 'wNAs9JSdKmY+nS9xdwiMVBLuXRtEtBgE+18uo7Cl4V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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