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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb73304e3b49969174bdbbd1f32cb55a3edde3cea433a3053a3a228ec2148f9' 
  AND token = 'KIk3ybZIa07j4sfEfzEYaSkmtxBuZ1PcU3xltUnVl7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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