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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2e09b27e8f5ed6b8f209bcc043547eff53340903f8a34e917ccc37018375f3' 
  AND token = 'pjpstoY0cfixprvCW0vMrpEKzCqkfxGCWC4JgFY7oWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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