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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b755fa7bc00c711b9595a3b47d588060d5c6ef159176aae9fb865aa6bd005619' 
  AND token = 'ARWRRM7wRkXadITNtlT8BMN+Py/P/03H/a5ce1YdrRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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