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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c87ee73bf56b5699579a4d98588f3efb956c13bd10e9f7fbd76a81cf8b2e4' 
  AND token = 'bEAukB3Y2QgHWU+d8d9n7ECFNXaz8ceun5juIp420Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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