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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fd1c328f00fc622be5efcfbc0924b547826db8d8af86bfef72f45d1ff8f696' 
  AND token = 'k3btvWy4cLBMbuK7yau0xnp6utoixH6/5wgbZ/+eb5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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