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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351c90131d81fdfefd17e0f81bf10ff7fdc9d6b099c4d0d6cc78de990c445e64' 
  AND token = 'mvVoSmobIZNQpPRelYI6KYhbYId/hOjrsWfS26mrOVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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