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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536fe7be3f08b94362c1d1461af25d971eefa4fe429de2fbdbc1b72d5b0c5570' 
  AND token = '14Le+sW7u6tGM9tDVQv8BVrpnX2/K9NueSKaTSd+Hro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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