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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39597af0f2bb5362221d8f5bbecb7413f63475944202a0415ff849faa69576c7' 
  AND token = 'SyjQzGEmkmoPb7E+HjfoAZWBc/Xu2ToGQdG5lID69J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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