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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bc6115f50be4162c97e9a31cf80c53fb94a155d40cc679dde81448914772cf' 
  AND token = 'GsQotboKRhuk5H68hUcOeFRJ2t7ZGaLuM3CloSIjIXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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