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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ffaa270e0e4c65557393631976021c793e466a694532355dd0e647555b7ac8' 
  AND token = 'pR1TyITFcUabz17E89+vbYmKEYIP5Tpl5y05Mfy3J/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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