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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84fdc4a29a6e70ddc6427515886e6467b6c2935cfd8af33e0187d5e6412fc22' 
  AND token = '0v/7JURLQH8u9PpTGdjwUk4Jrl27lqFeqU2n48xQljI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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