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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23583811f060ddd0e5eac9b787286168317b9ea3068789db1abf6ba4c9f9823e' 
  AND token = 'xl3rhkUyR+yesc/NiUyKALfX2f+lMC+ffpkIuNxs+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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