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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391c0ab67ff7d87590345d4431f4d6bb6861d499299c5eab7426740a3d4e799e' 
  AND token = 'ZNxrobtkiU4VFAlRL617bxXVT0IWV1Q4CWdB/qEHqkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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