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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f78a53caa4986982b735d9fe7c0b6472941395d42aa8021eb62c6943a4021c9' 
  AND token = 'Bfy/cCaO39D94qRASq2jB7gSL/gQ7WxE6gmdSRTYsRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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