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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9c6ae4fad46b6976af771e6e8a160e3d83e9d56891f26a0fb194251ddfd91a' 
  AND token = '1zIT03DsS9nd1o0JlMK2oaShpywfDWwFRRT6bNkx5D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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