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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d9468cd28d3ee847a712de5f85e086b0fcabb099ddf87d72e365624041099c' 
  AND token = 'NGHoTibtYmmqlzI1Wa9a0BzhfoBiXVo0R+4U19E9jv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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