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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5136b58d9b226e5edd15bd6c37760f38cfc31b806ffdacf5946377b6ca3959' 
  AND token = 'jHsYCRlHtYGAE0BK8oq5mYaFgTddTJyAkaNFHep6Veo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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