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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3858dcc725ce19bcf7409932dc0bb1e90ec89cbc9e5c7cb22ef73d43fbad9f1f' 
  AND token = 'YwrMGjZXvedZ7kU88t/UmazLl87LmjJKm3r9tMm4kVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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