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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde0924b8a7d371bdff9d359476dc5f40eb05aa509f3848cbfc59662f0b7652b' 
  AND token = '3en0ibVR/vHlPUTsoDqJhVJ+QEcOmeeY3mknXEvU9zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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