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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82db17ed4bf9a2d03ed41a72cafe9d3fd3f09e2f7e402a1baa81b2567305e6e' 
  AND token = 'iH4CBfDyhzfguTCd1gDKBb7CT7RpZP3ghp6fVxlK1n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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