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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc3bb384880619c5df4255d37c02a0271d1685d7610d22f47dd47ea8682017f' 
  AND token = 'tCERlvo0thPs7cX+WqWMPCJMftgoI6G66hpxuSA6iVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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