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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1f62d992d0a493cc4cf26443b91daeba91153a19915368bd5e716007ab8e2a' 
  AND token = 'UVIJfrF9R+xc/O8WQYdjDAE0WBllZQMtRAdrZ9zijjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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