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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccaf2b4f96778702be540b1f7f38d4220c4a9336c03e8c3d3dc13c48d59ab62' 
  AND token = '2gONejjzuIOaBiJO1sIWaICHIvKZTPuEMfYNrHb3Rj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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