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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89416fad8ec2906656de3f3b0bcd92c8fec93f7363642d0049c4abade0dad34f' 
  AND token = 'ccr370U+1JIhMWxWgCxS5MM315v/dDmfDnr7+msIUQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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