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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ddc41623cf2c2b49f7d7b69b063dac6a3c44ab5b882242f26335ce00ce474b' 
  AND token = '/8C6Au0di3ayrVk+wsP4tFGNcuNBLzV7i3Qlz4RACy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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