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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1b16c8f740a902552efb1d82b42f697dde1bcc1f8db410d4d73704dee97fb1' 
  AND token = 'XMgUJfO2R8ApbaKkgIHWS7aN1aGbrLagiv20EntZ+PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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