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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6babe126641382f9b90430fbe44baae5a22f340427d0c2099e130fc81270d13c' 
  AND token = 'bj3d5i+VWtUUnhFW2UVuEMJq6g9ajT5ngOrDeaRuo7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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