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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0915429dc2a6506f14a71b4e6537757940e7a5631538348d22b68437b61e24e5' 
  AND token = '8+zlYg5nWFj5GRhK+8u9D8rEa00gEx95uOeamSc87dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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