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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03904f2b1b4c76640432c0772add7b7e155134f169120a59f303bc8c2865ed1' 
  AND token = 'Yof1EU7kuc0pwIq15d83PEuU0hYstNExLUbaLNI6u/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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