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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa4fdfe8de766cc61810ff98e731d1632e4b00d3ff3a77458fd4ee71a505679' 
  AND token = 'tE6HBrUkRiIiTzG7D/cr7zP5b9s2mFljBXygCvTgCYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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