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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcaba3502309f56eb75be5259d0b839dd3f85bbb3c2a7dcba859c511b8b82ed' 
  AND token = '8hTaGD0+abKTCQJUCLttjb5b8O3wRHGufpQt9/W773M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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