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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9482aae7041aae80653485d23df946f7080c1c7940fe4fdad75412eff85ba1a' 
  AND token = 'EF54xYPF4WfaJe7O4K8YV5U2olttgw503A9NLgFt+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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