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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e051b70fc100352bd0ed36eedbc01f69ce90c43d59ce59caacd16cde37c5b2' 
  AND token = 'i1xMH5RnfYq3BFVM+us8xS+10QvM+28O+VmgtiHXOP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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